When considering a procedure, it is essential to be evaluated and to discuss the risks, benefits and alternatives of that procedure. You should also discuss the goals that are anticipated.
The pocket is usually made under a thin but strong membrane called the periosteum with the pocket made to the exact size. The pocket then shrinks down around the implant to hold if firmly in place and it will feel just like your chin - you will not be able to wiggle it.A a screw is not usually...
Jaw surgery with orthodontics is best. Chin osteotomies and ramal augmentation could mask the look but be happy with the proper plan. Common development pattern for sure